Hudson Technologies is trading 5.12% higher at $5.36 after the September 28 regular-session close of $5.10, with no clear company-specific announcement or catalyst dated September 28 found in available coverage.
- The latest company-specific news located was a September 17 joint development agreement with Icorium, not a new September 28 announcement.
- Broader U.S. indexes declined on September 28, so the available information does not explain the after-hours rise.